• 제목/요약/키워드: Al 6061-T6

검색결과 115건 처리시간 0.02초

해수용액에서 선박용 Al-Mg-Si 합금의 전기화학적 실험에 의한 방식전위 결정 (The Protection Potential Decision by Electrochemical Experiment of Al-Mg-Si Alloy for Ship in Seawater)

  • 정상옥;박재철;한민수;김성종
    • Corrosion Science and Technology
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    • 제9권1호
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    • pp.48-55
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    • 2010
  • The many vessels are built with FRP(Fiber-Reinforced Plastic) material for small boats and medium vessels. However, FRP is impossible to be used for recyclable material owing to environmental problems and causes large proportion of collision accidents because radar reflection wave is so weak that large vessels could not detect FRP ships during the sailing. Hence, Al alloy comes into the spotlight to solve these kinds of problems as a new-material for next generation instead of FRP. Al alloy ships are getting widely introduced for fish and leisure boats to save fuel consumption due to lightweight. In this study, it was selected 6061-T6 Al alloy which are mainly used for Al-ships and carried out various electrochemical experiment such as potential, anodic/cathodic polarization, Tafel analysis, potentiostatic experiment and surface morphologies observation after potentiostatic experiment for 1200 sec by using the SEM equipment to evaluate optimum corrosion protection potential in sea water. It is concluded that the optimum corrosion protection potential range is -1.4 V ~ -0.7 V(Ag/AgCl) for 6061-T6 Al alloy, in the case of application of ICCP(Impressed current cathodic protection), which was shown the lowest current density at the electrochemical experiment and good specimen surface morphologies after potentiostatic experiment for Al-Mg-Si(6061-T6) Al alloy in seawater environment.

인공시효된 Al6061-T6의 초음파 비선형 특성 평가 (Evaluation of Ultrasonic Nonlinear Characteristics in Artificially Aged Al6061-T6)

  • 김종범;이경준;장경영;김정석
    • 비파괴검사학회지
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    • 제34권3호
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    • pp.220-225
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    • 2014
  • 초음파 비선형 특성은 일반적으로 재료 내부를 전파한 초음파의 기본주파수 및 2차 고조파 성분 크기에 의해 결정되는 비선형 파라미터 ${\beta}$로 측정되며, 재료의 미세한 변질을 평가하는데 효과적인 인자로 알려져 있다. 이에 본 연구에서는 인공시효된 Al6061-T6의 열처리 시간에 따른 초음파 비선형 특성을 평가하였다. 초음파가 시편을 투과하여 수신되는 신호를 분석하여 비선형 파라미터 ${\beta}$를 구하였고, 비선형 파라미터 측정 후 마이크로 비커스 경도를 측정하였다. 비선형 파라미터 측정 결과로부터 열처리 시간에 따른 재료 내 미세 구조적인 변화를 추정하였으며, 경도 측정 결과로부터 이러한 추정이 합당함을 증명하였다. 측정 결과 비선형 파라미터는 석출거동 메커니즘에 의한 재료 미세조직 변화와 매우 밀접한 상관관계를 나타냈다. 이로부터 초음파 비선형 파라미터를 이용하여 인공시효에 의한 재료 내 미세구조 및 상태 변화를 초음파 비선형 파라미터로 평가할 수 있음을 확인하였다.

미끄러짐 모드에서의 경량 재료를 이용한 이중외팔보 시험편의 파손 특성 (Fracture Characteristic of Double Cantilever Beam Specimen Using Lightweight Material at Sliding Mode)

  • 김재원;조재웅
    • 한국기계가공학회지
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    • 제20권3호
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    • pp.16-23
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    • 2021
  • The fracture characteristic of the bonded interface under the application of a sliding load to a double cantilevered specimen manufactured using lightweight material was examined. Inhomogeneously bonded materials such as Al6061-T6, CFRP, and CFRP-Al were employed. In the experiment, the specimen was loaded on both directions by applying a shearing load to the bonding interface. The experimentally obtained stress, specific strength and energy release rate values were examined. CFRP exhibited excellent specific strength. The experimental results demonstrated that the inhomogeneous bonded material CFRP-Al exhibited an overall high performance in comparison with the single materials.

고분자 전해질 연료전지 금속 분리판용 금속의 염화물 농도에 따른 전기화학적 특성 연구 (Investigation on Electrochemical Characteristics of Metallic Bipolar Plates with Chloride Concentrations for PEMFC)

  • 신동호;김성종
    • Corrosion Science and Technology
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    • 제20권6호
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    • pp.347-360
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    • 2021
  • Currently, the demand for eco-friendly energy sources is high, which has prompted research on polymer electrolyte membrane fuel cells. Both aluminum alloys and nickel alloys, which are commonly considered as materials of bipolar plates in fuel cells, oxide layers formed on the metal surface have excellent corrosion resistance. In this research, the electrochemical characteristics of 6061-T6 aluminum alloy and Inconel 600 were investigated with chloride concentrations in an acid environment that simulated the cathode condition of the PEMFC. After potentiodynamic polarization experiments, Tafel analysis and surface analysis were performed. Inconel 600 presented remarkably good corrosion resistance under all test conditions. The corrosion current density of 6061-T6 aluminum alloy was significantly higher than that of Inconel 600 under all test conditions. Also, 6061-T6 aluminum alloy and Inconel 600 presented uniform corrosion and intergranular corrosion, respectively. The Ni, Cr, and Fe, which are the main chemical compositions of Inconel 600, are higher than Al in the electromotive force series. And a double oxide film of NiO-Cr2O3, which is more stable than Al2O3, is formed. Thus, the corrosion resistance of Inconel 600 is better.

A6061-T6과 A5052-H32재의 이종 마찰교반용접시 핀 형상이 기계적 강도에 미치는 영향에 관한 연구 (A Study on the Effect that Pin Shape on Mechanical Strength in Dissimilar Friction Stir Welding A6061-T6 and A5052-H32)

  • 박희상;최원두;고준빈;이영호;신기석;김인철;최만용
    • 한국생산제조학회지
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    • 제18권3호
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    • pp.270-278
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    • 2009
  • Friction stir welding is a relatively new solid state joining process. A6061-T6 and A5052-H32 aluminium alloy has gathered wide acceptance in the fabrication of light weight structures requiring a high strength to weight ratio and good corrosion resistance. This friction stir process uses a non-consumable tool to generate frictional heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, etc., and tool pin profile play a major role in deciding FSP zone formation in A6061-T6 and A5052-H32 aluminium alloy. Three different tool pin profiles have been used to fabricate the dissimilar butt joints. The formation of friction stir processed zone has been analysed macroscopically. Tensile properties of the joints have been evaluated and correlated with the friction stir processed zone formation.

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Al 6061 합금의 고온 소성변형 조건의 예측 (Prediction of High Temperature Plastic Deformation Variables on Al 6061 Alloy)

  • 김성일;정태성;유연철;오수익
    • 소성∙가공
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    • 제8권6호
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    • pp.576-582
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    • 1999
  • The high temperature behavior of Al 6061 alloy was characterized by the hot torsion test in the temperature ranges of 400∼550℃ and the strain rate ranges of 0.05∼5/sec. To decide optimum deformation condition, three types of deformation maps were individually made from the critical strain (εc). deformation resistance(σp) and deformation efficiency (η). The critical strain(εc) for dynamic recrystallization (DRX) which was decided from the inflection point of strain hardening rate(θ) - effective stress (σ) curve was about 0.65 times of peak strain (εp). The relationship among deformation resistance (peak stress, σp), strain rate (ε), and temperature (T) could be expressed by ε=2.9×1013[sinh(0.0256σp]7.3exp (-216,000/RT). The deformation efficiency (η)which was calculated on the basis of the dynamic materials model (DMM) showed high values at the condition of 500∼550℃, 5/sec for 100% strain. The results from three deformation maps were compared with microstructures. The best condition of plastic deformation could be determined as 500℃ and 5/sec.

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Corrosion Behavior of Arc Weld and Friction Stir Weld in Al 6061-T6 Alloys

  • Yoon, Byoung-Hyun;Kim, Heung-Ju;Chang, Woong-Seong;Kweon, Young-Gak
    • Corrosion Science and Technology
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    • 제5권6호
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    • pp.196-200
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    • 2006
  • For the evaluation of corrosion resistance of Al 6061-T6 alloy, Tafel method and immersion test was performed with Friction Stir Weld(FSW) and Gas Metal Arc Weld(GMAW). The Tafel and immersion test results indicated that GMA weld was severely attacked compared with those of friction stir weld. It may be mainly due to the galvanic corrosion mechanism act on the GMA weld.

마찰교반 점용접(FSJ)을 이용한 자동차용 Al 합금의 파단특성 (Fracture mode of friction spot joined Aluminum alloy used in automobile industry)

  • 김특기;천창근;;김홍주;장웅성
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2007년 추계학술발표대회 개요집
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    • pp.316-318
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    • 2007
  • Friction Spot Joining(FSJ) has a strong potential for aluminum alloy joining in automobile industries. The present paper focuses on the attempt to optimize the FSJ process for lap joining of A5052-H32 and A6061-T6 aluminum alloys. For A5052 maximum tensile shear strength has been observed for a tool rotating speed of 800rpm and for A6061 at 1000 rpm. Study on fracture modes of the tensile tested specimens of both A5052-H32 and A6061-T6 revealed, for high tensile strength values, plug fracture mode and lower tensile values, shear fracture mode. Above 2000 rpm distortion of the base metal, beside the tool shoulder was larger and plug fracture mode has been observed.

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알루미늄 판재 성형해석 시 파단 모델 적용 (Application of Failure Criteria in Aluminum Sheet Forming Analysis)

  • 김기정;;김대영;김헌영
    • 소성∙가공
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    • 제20권2호
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    • pp.167-172
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    • 2011
  • The numerical simulation of the Forming Limit Diagram(FLD) test was carried out to calculate the limiting dome height(LDH: ISO12004-2) for aluminum alloy sheet Al6061-T6. The finite element analysis was used as an effective method for evaluating formability and diagnosing possible production problems in sheet stamping operations. To predict fracture during the stamping process, several failure models such as Cockcroft-Latham, Rice-Tracey, Brozzo and ESI-Wilkins-Kamoulakos(EWK) criteria were applied. The predicted results were discussed and compared with the experiments for Al6061-T6.

알루미늄합금판재 성형한계 예측을 위한 파단모델 적용 (Application of Failure Criteria in Aluminum sheet Forming Analysis)

  • 이은국;김헌영;김형종;김흥규
    • 한국표면공학회:학술대회논문집
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    • 한국표면공학회 2011년도 춘계학술대회 및 Fine pattern PCB 표면 처리 기술 워크샵
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    • pp.207-207
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    • 2011
  • The numerical simulation of the Forming Limit Diagram(FLD) test was carried out to calculate the limiting dome height(LDH: ISO12004-2) for aluminum alloy sheet Al6061-T6. The finite element analysis was used as an effective method for evaluating formability and diagnosing possible production problems in sheet stamping operations. To predict fracture during the stamping process, several failure models such as Cockcroft-Latham, Rice-Tracey, Brozzo and ESI-Wilkins-Kamoulakos(EWK) criteria were applied. The predicted results were discussed and compared with the experiments for Al6061-T6.

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